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2026.01.28
Is it true that fat injections can make breasts smaller? Cosmetic Surgeon Toshiyuki Saiga explains the process and fixation mechanism.
Under the philosophy of 'Science & Art,' our cosmetic surgeons always prioritize what is best for the patient in their practice. Drawing from experience as a cardiovascular surgeon, we apply advanced techniques grounded in deep anatomical understanding to aesthetic medicine. We also pursue artistic sensibility to enhance each individual's unique features. Renowned for calm, reassuring consultations, we specialize in liposuction, breast augmentation, double eyelid surgery, and anti-aging treatments. With scientific evidence and proven techniques, we guide patients toward realizing their ideals.


Hello, I am Toshiyuki Saiga, Director of Bianca Clinic Ginza Clinic. My name is Toshiyuki Saiga, Director of Bianca Clinic Ginza.
We are sometimes consulted by people who have had fat injections for breast augmentation who feel that their breasts have become smaller. The appeal of fat injectable breast augmentation is that it looks and feels natural, but the speed of change is slow. If you understand this point properly, you will feel at ease after the surgery.
In this article, we will explain in an easy-to-understand manner from a physician's perspective why fat injection breast augmentation is said to look smaller, how the fixation works, and what you need to know in order to undergo the procedure safely.
What kind of procedure is fat injection breast augmentation in the first place?

Fat injection breast augmentation is a procedure in which your own fat harvested from your abdomen or thighs is transplanted to your breasts for breast enhancement. This is the procedure of choice for those seeking a change that looks and feels natural and blends in with their own body.
The process of harvesting and injecting fat is very delicate. The degree to which fat cells can be harvested without damaging them, and the degree to which they can be injected evenly into the appropriate layer will affect the finished product and the fat retention rate.
Bianca Clinic offers Condense Rich Fat Injection Breast Augmentation. Only carefully selected condensed rich fat (CRF) is used, after carefully separating impurities, aging cells, and water from the collected fat with special equipment. By carefully selecting the fat to be injected into the breast, it is easier to achieve a better fit.
▷For more information about condense rich fat injected breast augmentationHere
Fat Injection Breast Augmentation "Makes You Smaller?" Reasons why you are likely to feel
After receiving fat injections breast augmentation, you may feel a temporary reduction in size. But this is common and there is no need to worry. First, it is important to understand why.
Some of the injected fat is absorbed over time.
In fat injection breast augmentation, the transplanted fat does not remain 100% intact. Since fat is a living tissue, it will be absorbed naturally if blood does not circulate properly after transplantation. This is a characteristic of fat injections, and it is more accurate to say that the amount of fat that is not retained is absorbed than to say that it has been reduced.
Multiple factors such as injection technique, body type, and lifestyle affect how well they settle in, but it is important to know that the size immediately after the procedure is not the final size, so you are less likely to be concerned about any changes.
Immediately after surgery, the swelling tends to make it appear larger.
Many people feel that their breasts look their largest immediately after surgery because of the swelling effect. When fat is removed or placed, the anesthetic solution causes temporary swelling of the tissue, which may make it appear more voluminous than it actually is.
As the swelling goes down over the next few days to weeks, you may ask yourself, "Huh? It's smaller than before?" but in most cases, this is a process of swelling going down and the breasts returning to their natural shape. The tension and firmness of the breasts will also gradually subside, and a more natural line will appear as the temporary changes caused by the procedure disappear.
After 3 months, the volume of the settled fat is visible.
The most important aspect of the process of fat injection breast augmentation is that it takes several months to finalize. Fat is easily absorbed until about one to two months after surgery; after three months, the changes settle down and the volume of the remaining fat becomes more defined. At this time, many people can feel their breasts soften and develop a natural roundness.
Exercise and lifestyle changes can feel like a change.
The process of fat retention is very delicate. For a while after the surgery, the shape of the breasts may look different from day to day. For example, if you immediately engage in strenuous exercise or continue to hold your breasts in a posture that puts pressure on them, swelling may temporarily increase or decrease, and you may feel that they are a little smaller.
However, this is only a temporary change in appearance. It does not mean that the fat itself will be greatly reduced. Knowing that this kind of change is possible, we can calmly monitor the progress of the process.
What you need to know to improve retention rates
The retention rate is a major determinant of satisfaction with fat injected breast augmentation. How well the injected fat remains in the breast depends not only on the procedure, but also on how the patient spends time after the surgery.
The quality of the fat injected determines the results.

Bianca Clinic's Condense Rich Fat Injection Breast Augmentation uses a special technique to concentrate the harvested fat and selects only the fat that will settle easily for injection. This ingenuity in improving the quality of the fat leads to a natural appearance and high retention rate.
Even with the same fat injections, the results will vary depending on the condition of the fat used. In particular, fat used for the breasts requires delicate processing, so the choice of procedure is very important.
Postoperative lifestyle affects fat.
As mentioned earlier, injected fat is delicate. Therefore, it will remain unstable for 2-3 weeks until it is fixed. During this time, strong pressure, strenuous exercise, and alcohol consumption may increase the load on the fat and prevent it from settling. However, there is no need to be overly concerned. By following the doctor's instructions and refraining from activities that are hard on the breasts, a more natural and beautiful result can be expected.
Second and third times may be necessary depending on desired size
In fat injection breast augmentation, there is a limit to the amount of fat that can be injected at one time. This is to avoid excessive strain on the skin and tissues. Therefore, it is possible that the desired size may not be achieved after only the first procedure. For this reason, some patients consider a second treatment. By injecting fat in stages, we can approach the ideal volume while taking into consideration the burden on the breasts.
How does it change the feel and appearance? What do those seeking naturalness want to know?

One of the advantages of fat injection breast augmentation is the naturalness of the final touch. On the other hand, during downtime, swelling and inflammation can cause tension and temporary hardness, which can be perceived as a disadvantage in some situations. Knowing in advance how the postoperative feel will change will give you peace of mind.
Immediately after surgery, there may be some tension.
Immediately after the injection, the breasts are more tense than usual due to swelling and inflammation. As the breasts settle over several weeks, they will naturally become softer to the touch.
Natural softness over time
As absorption and fixation settle down, the fat blends with the breast tissue and becomes naturally soft and well-rounded. Some people ask, "Do the breasts feel the same to the touch as real breasts?" Since the fat was originally from your body, you can expect a result that is similar to the natural feel of your breasts.
What you need to know when looking at fat injection breast augmentation cases

Condense Rich Fat Injection Breast Augmentation 【Photo Description】Top:Before Bottom:One month after 【Cost】1,210,000 yen *Anesthesia and breast band fees will be charged separately. Risks and side effects] Swelling, internal bleeding, left-right difference, infection, hematoma, unevenness, pulmonary embolism, burns, complications associated with anesthesia, etc.
Case photos posted on social networking sites and the web are an important source of information when considering a procedure. However, there are some precautions that must be taken in order to properly judge a case.
Case Photos from "What Would My Body Look Like?" See in
The shape of the breasts is determined by a combination of many factors, including skeletal structure, skin condition, and amount of fat. Even if the same amount of fat is injected, the appearance can be completely different depending on the body shape. Many people look at case photos and think, "I want to look like her! However, it is important to think about "how your body would look like" rather than "I want to look like her.
Understand the changes during the process that are not visible in the case photos.
Most cases are photographed at the time of completion. Therefore, detailed changes such as the time of swelling or the process of fat absorption are not captured in the photographs. Please keep in mind that fat injection breast augmentation is a procedure that takes a long time to complete, and use this information as a reference.
For Those Considering Fat Injection Breast Augmentation|What BIANCA CLINIC values

Fat injection breast augmentation is a procedure that should be performed not only to improve the appearance of the breasts, but also to consider compatibility with the body and future changes. Here, we would like to share with you some of the ideas that Bianca Clinic values.
Suggesting the right size and method for your body.
An unreasonable increase in size not only puts a strain on the breasts, but can also cause problems. We carefully check each person's body shape and breast condition, and try to propose the best design for that person.
To create breasts that can remain natural for a long time.
Breasts are a part of the body that changes shape with age, childbirth, and weight fluctuations. That is why we believe that treatment that takes into consideration not only the present but also future changes will lead to long-term satisfaction.
Proper understanding of the changes over time and safe fat injection breast augmentation.
With fat injection breast augmentation, the breasts may temporarily feel "smaller" due to postoperative swelling and fat absorption. However, most of these changes are within the natural course of events and will gradually subside over time. If you are concerned about the fluctuation of the process, please do not keep it to yourself.
At Bianca Clinic, we focus on Condense Rich Fat Injection Breast Augmentation, a method that reduces the burden on the body while achieving a natural result. We would be happy to work with you to determine the best approach for your body.
▷For more information about condense rich fat injected breast augmentationHere
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